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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 632 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Half of 26 =
  2. 2.Half of 144 =
  3. 3.Double 23 =
  4. 4.Double 37 =
  5. 5.Double 17 =
  6. 6.Double 31 =
  7. 7.Half of 34 =
  8. 8.Double 41 =
  9. 9.Double 44 =
  10. 10.Half of 116 =
  11. 11.Half of 106 =
  12. 12.Half of 54 =
  13. 13.Half of 68 =
  14. 14.Half of 138 =
  15. 15.Double 86 =
  16. 16.Double 52 =
  17. 17.Half of 36 =
  18. 18.Half of 56 =
  19. 19.Half of 190 =
  20. 20.Half of 140 =
  21. 21.Double 68 =
  22. 22.Double 65 =
  23. 23.Double 38 =
  24. 24.Double 45 =
  25. 25.Half of 188 =
  26. 26.Double 88 =
  27. 27.Double 91 =
  28. 28.Half of 70 =
  29. 29.Double 32 =
  30. 30.Double 85 =
  31. 31.Half of 92 =
  32. 32.Half of 102 =
  33. 33.Half of 84 =
  34. 34.Double 83 =
  35. 35.Half of 94 =
  36. 36.Half of 184 =
  37. 37.Double 24 =
  38. 38.Double 66 =
  39. 39.Half of 110 =
  40. 40.Double 84 =

Answer key

  1. 13
  2. 72
  3. 46
  4. 74
  5. 34
  6. 62
  7. 17
  8. 82
  9. 88
  10. 58
  11. 53
  12. 27
  13. 34
  14. 69
  15. 172
  16. 104
  17. 18
  18. 28
  19. 95
  20. 70
  21. 136
  22. 130
  23. 76
  24. 90
  25. 94
  26. 176
  27. 182
  28. 35
  29. 64
  30. 170
  31. 46
  32. 51
  33. 42
  34. 166
  35. 47
  36. 92
  37. 48
  38. 132
  39. 55
  40. 168

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